Learning all 5 positions of the minor pentatonic scale is not required to learn how to solo. Using just a few notes from the scale is more than enough. In the beginning, you should concentrate on just using a few notes, for example the 1st scale shape, or the top 5 notes of the 2nd position minor pentatonic.
Learning how to connect the scale patterns might also be useful, but not required at first:
Now learning to solo is not just a matter of knowing the shapes and notes. Timing is very very important, as are the vibratos, slides and bends. That adds the style.